\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
Déterminer la matrice opposée de \(A = \begin{pmatrix} -1 & 7 \\ 0 & -2 \\ \end{pmatrix}\).
\(-A = \begin{pmatrix}\input{14129}{}{3em}{2em}{}{} & \input{24129}{}{3em}{2em}{}{}\\\input{34129}{}{3em}{2em}{}{} & \input{44129}{}{3em}{2em}{}{}\\ \end{pmatrix} \)